Duck Foaming Bleach Gel cleverly combines the benefits of bleach and the cleaning action of bubbly foam all in one product. Maybe not brilliant-German-scientist kind of clever, but, you know, for a toilet product this is pretty smart. Top-marks kind of smart. Anyway, using the uniquely shaped neck, squeeze the liquid evenly all around the inner rim of the toilet bowl. Brush above and below the water line. Then flush.